Bottlebrush – planted one month ago – What is wrong?

This bottlebrush plant was planted about one month ago and the leaves immediately started to drop. The man who planted said the plant was in shock. I gave it a bit of super thrive But the plant is going down hill fast. It gets at least six hours of bright sunlight a day. What to do??
Note: The pink behind the bottle brush is a pink flowering geranium.
Thank you very much.
Best Regards
Elizabeth Wetzel
The Woodlands TX